Method for concentrating oxygen isotope

a technology of oxygen isotopes and oxygen isotopes, which is applied in the direction of isotope separation, separation process, dispersed particle separation, etc., can solve the problems of low luminescence efficiency of laser light, low utilization efficiency of light, and post-processing necessity, so as to reduce facilitate the handling of ozone. , the effect of reducing the concentration rate of oxygen isotopes

Inactive Publication Date: 2006-11-09
NIPPON SANSO CORP
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  • Description
  • Claims
  • Application Information

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Benefits of technology

[0036] As another method of concentrating oxygen isotopes of the present invention, ozone concentration can be lowered by adding a suitable amount of a rare gas to the ozone in order to prevent in advance any decreases in the concentration rate of oxygen isotopes caused by spontaneous dissociation of ozone.
[0037] Since rare gases (helium, neon, argo...

Problems solved by technology

However, for reasons such as a low concentration rate, low utilization efficiency of the light that contributes to the reaction, low luminescence efficiency of the laser light and the necessity for post-processing for extracting the concentrated chemical species, the methods of the prior art have ...

Method used

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  • Method for concentrating oxygen isotope
  • Method for concentrating oxygen isotope
  • Method for concentrating oxygen isotope

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first embodiment

[0097]FIG. 3 is a system diagram showing the oxygen isotope concentration device of the present invention. This concentration device is provided an ozonizer 21 for obtaining ozone from raw material oxygen, a first distillation tower 22 that separates the ozone formed with this ozonizer 21 and the raw material oxygen, a condenser 23 for imparting the cold required by the low-temperature distillation procedure in this first distillation tower 22, a reboiler 24 for generating rising gas in the first distillation tower, a heat exchanger 25 for recovering the cold of the first distillation tower effluent gas in the first distillation tower feed gas, a buffer tank for temporarily storing the first distillation tower effluent gas, and a blower 27 for circulating and feeding first distillation tower effluent gas in buffer tank 26 to ozonizer21.

[0098] The equipment for concentrating oxygen containing a specific isotope from the ozone is provided with a photoreaction cell 32 for separating a ...

second embodiment

[0106]FIG. 4 is a system diagram showing an oxygen isotope concentration device. It shows an example of the configuration of a device provided with equipment for obtaining a rare gas-ozone mixed gas in a stage prior to the concentration device.

[0107] This concentration device, together with being provided with an ozone formation unit 111 that forms ozone from raw material oxygen GO, an ozone separation unit 112 that separates raw material oxygen containing ozone formed in said ozone formation unit 111 into ozone OZ and raw material oxygen RO, an ozone photodissociation unit 113 that selectively degrades ozone containing a specific oxygen isotope in its molecule into oxygen by irradiating the ozone OZ separated in said ozone separation unit 112 with light L of a specific wavelength, and an oxygen isotope concentration unit 114 that separates oxygen OC formed by the dissociation of ozone in said ozone photodissociation unit 113 from non-dissociated ozone OZ to concentrate a desired ox...

third embodiment

[0127] Thus, oxygen generated by dissociation of ozone, non-dissociated ozone, krypton RG circulating within the system, and this rare gas KG composed of at least one type selected from helium, neon and argon can be fed into oxygen isotope concentration unit 114 in a mixed state. At least one type of rare gas KG selected from helium, neon and argon is separated into high boiling point ozone and krypton by a separation procedure such as low-temperature distillation in oxygen isotope concentration unit 114, and discharged with oxygen OC1 having a lower boiling point. Thus, although oxygen containing a specific oxygen isotope is obtained in a state that is diluted with rare gas, since the flow rate can be regulated more easily as compared with a small amount of high-purity oxygen, handling becomes easier. Here, other aspects of the device configuration are the same as those of the aforementioned

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Abstract

The object of the present invention is to provide an oxygen isotope concentration method capable of concentrating the stable oxygen isotopes of 17O and 18O which can be carried out using a simple device configuration.
The present invention relates to a method for concentrating an oxygen isotope in separated oxygen by irradiating ozone with light, selectively dissociating an isotopomer of ozone containing an oxygen isotope in its molecule into oxygen, followed by dissociating the ozone and separating the formed oxygen from the non-dissociated ozone. The basic configuration of the device is provided with an ozone formation unit 11 that forms ozone from raw material oxygen, an ozone separation unit 12 that separates ozone formed with said ozone generation unit and raw material oxygen, an ozone photodissociation unit 13 that radiates light of a specific wavelength onto the ozone separated by said ozone separation unit 12 and selectively dissociates ozone containing an oxygen isotope in its molecule into oxygen, and an oxygen separation unit that separates the oxygen formed by dissociating ozone in said ozone photodissociation unit 13 and non-dissociated ozone to concentrate the oxygen isotope in the oxygen. The present invention also relates to a method for concentrating an oxygen isotope comprising an ozone photodissociation step, in which light is radiated onto a rare gas-ozone mixed gas containing ozone and at least one type of rare gas selected from krypton, xenon and radon to selectively dissociate ozone containing a specific oxygen isotope in its molecule into oxygen, and an oxygen isotope concentration step, in which the oxygen separated from ozone in said ozone photodissociation step is separated from non-dissociated ozone and rare gas to concentrate the oxygen isotope present in the separated oxygen. An oxygen isotope may also be concentrated in a dissociation reaction product by irradiating a gas containing a peroxide selected from hydroperoxides, (di)alkyl peroxides, peroxyacids including peracids, (di)acyl peroxides, peroxy esters, peroxycarbonates, peroxydicarbonates, diperoxycarbonates, peroxalates, cyclic peroxides, ozonides and endoperoxides, nitrite esters and nitrate esters, and selectively dissociating a peroxide containing a specific oxygen isotope in its molecule.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method for concentrating oxygen isotopes, and more particularly, to a method for selectively concentrating the stable oxygen isotopes, 17O and / or 18O, which exist in extremely small natural abundance, by using an ozone photodissociation reaction or a peroxide photodissociation reaction. [0003] 2. Description of the Related Art [0004] Since 17O and 18O, which are oxygen isotopes used as tracers in the fields of chemistry and medicine, exist in extremely small natural abundance, it is necessary that they be concentrated. A known method for concentrating 18O consists of obtaining a product that contains 18O by selectively photodissociating a saturated chain ether that contains 18O by irradiating it with laser light (refer to, for example, Japanese Examined Patent Application, Second Publication No. 6-102134). Other methods include a method for selectively concentrating 18O by irradiat...

Claims

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Application Information

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IPC IPC(8): B01D5/00B01D59/34
CPCB01D59/34
Inventor HAYASHIDA, SHIGERU
Owner NIPPON SANSO CORP
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